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Method for selectively oxygenizing NO in hydrocarbons gas and oxidation tube therefor

A hydrocarbon gas and hydrocarbon oxidation technology, which is applied in the field of oxidation tubes, can solve the problems of measuring the NO content of cracked gas, etc., and achieve the effects of accurate results, simple operation and simple structure

Active Publication Date: 2007-12-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to measure the NO content in cracked gas with conventional oxidants

Method used

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  • Method for selectively oxygenizing NO in hydrocarbons gas and oxidation tube therefor
  • Method for selectively oxygenizing NO in hydrocarbons gas and oxidation tube therefor
  • Method for selectively oxygenizing NO in hydrocarbons gas and oxidation tube therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] (1) Preparation of the NO oxidizing material of the present invention.

[0027] Take 4.7 mg of 2-phenyl-4,4,5,5-tetramethyl-3-oxoimidazolium-1-oxyl radical (PTIO) produced by Tokyo Chemical Co., Ltd., and dissolve it in 10 mL of acetone to prepare Dipping solution. Pour the dipping solution into a watch glass filled with 20 grams of quartz sand with a particle diameter of 4.5 to 9.0 microns, stir evenly, and dry in a fume hood in the dark to obtain PTIO quartz sand A coated on the surface.

[0028] (2) Preparation of oxidation tubes.

[0029] Pour 20 grams of the quartz sand A prepared in step (1) into a U-shaped or straight glass tube and fill it up to obtain an oxidation tube. Wrap the oxidation tube with aluminum foil and store it in the freezer for later use.

example 2

[0037] The oxidation tube outlet described in example 1 is connected in series with NO 2 Absorption tube, 10 ml of 0.05 mol / L triethanolamine solution in the absorption tube. Nitrogen with a NO concentration of 7.3 μL / L was used as the standard gas, and the standard gas was diluted with nitrogen to obtain an experimental gas with nitrogen as the base gas, and the base gas was other gases except NO. Pass the experimental gas through the oxidation tube, and then through the absorption tube. When the NO in the gas passes through the oxidation tube, it is oxidized by nitrogen and oxygen radicals, and the product after oxidation is converted into NO by the absorption liquid. 2 - and NO 3 - ions, more than 90% of NO oxidation products in the absorption solution are converted to NO 2 - , the absorption solution was analyzed by ion chromatography, and the NO in it was measured 2 - and NO 3 - concentration, and thus calculate the corresponding NO 2 quantity. The ion chromato...

example 3

[0040] Measure the amount of NO in the experimental gas according to the method of example 2, the difference is that the KMnO prepared in 10mL comparative example 1 is put into the used experimental gas oxidation tube 4 acidic solution. During the analysis, the collected amount of the experimental gas and the amount of NO contained in it, and the amount converted into NO 2 Theoretical amount, NO measured by ion chromatography 2 - , NO 3 - concentration and its corresponding NO 2 The amount is shown in Table 1.

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Abstract

The method of oxidizing NO in hydrocarbon gas material selectively is to pass hydrocarbon gas material through one inorganic matter layer coated with free nitrogen-oxygen radical as shown. The method can oxidize NO in hydrocarbon gas material only while maintaining other components un-oxidized, and may be applied in measuring the NO content in hydrocarbon gas material.

Description

technical field [0001] The invention relates to a gas oxidation method and an oxidation tube used therein, specifically a method for selectively oxidizing NO in hydrocarbon gases and an oxidation tube used therein. Background technique [0002] In recent years, the market demand for ethylene and propylene has been very strong. Catalytic cracking gas contains an appropriate amount of ethylene and propylene, which can be purified and utilized. However, the trace amount of NO contained in the catalytic cracking gas may have a negative impact on its subsequent processing, so it is necessary to determine the NO content. Currently, there is no effective method for determining the NO content in cracked gas. [0003] The concentration of NO in the pyrolysis gas is relatively low, generally between 0.001 and 2.0 μL / L, and it is difficult to directly analyze it with an instrument. However, the solubility of NO in liquid solution is relatively low, and the commonly used solution enri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G70/00
Inventor 张月琴杨海鹰韩江华
Owner CHINA PETROLEUM & CHEM CORP